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(No Model.)

J. W. LARISH. CALLING APPARATUS FOR TELEGRAPH CIRCUITS. w No. 861,365.Patented Apr. 19 1887.

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UNITED STATES PATENT OFFICE;

Josnrnw. rjArusr-r, E BUFFALO, :uEw YORK, Assreivon TO THE BALTL MOREAND OHIO TELEGRAPH COMPANY, OF BALTIMORE, MARYLAND.

CALLING APPARATUS-FOR TELEGRAPH-CIRCUITS.

SPECIFICATION forming part of Letters Patent No. 361,365, dated April19, 1887.

\ Application filed July 31, 1886. Serial No. 209,613. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOSEPH W. LARISH, a citizen of the United States,residing in Butfalo, in the county of Erie and State of New York, haveinvented'certain new and useful Improvements in Calling Apparatus forTelegraph-Circuits, of which the following is a specification.

The invention relates to the class of devices employed for attractingthe attention of or calling up the operators upon telegraphlines.

The object of the invention is especially to provide means whereby theoperator at a terminal branch office may attract the attention of anoperator at a distant repeating station without calling upon the mainoffice at the home station.

The invention consists in providing, at the station to be called, aharmonic reed or vibrator, and in locating at the point from which itmay be desired to produce the call a harmonic transmitter tuned to thesame pitch that the main-line connections are completed through thistransmitter. A series of electrical impulses are thereby sent to line,and these vitalize the electromagnet of the receiving-instrument'withthe proper frequency, and cause the harmonic reed to respond and to givea signal to the operator at that station.

The drawing is a diagram illustrating an organization of circuitsadapted to carry out the invention.

Referring to the drawing, L represents a main line connecting twodistant stations, A and A-for instance, New York and Buffalothrough abranch or repeating station, A The line L is equipped at the terminalstations A and A with a proper system of batteries, O and O and Withtheusual transmitting and receiving instruments, as.indicated at K and Kand It and R At the repeating or branch office A,also,thcre is provideda transmitter and receiver, H.

For the purpose of attracting the attention of the operator at theBuffalo office-A for instance-without calling up the operator at the NewYork station A, there is placed in a adapted to vibrate with a givenrapidity. The branch line 2, leading from a point, 1, in the main line,includes the coils of an electromagnet, (1, and leads to the armature e.The resting contact f of this reed-armature is connected by a conductor,3, with a point, 4, in the main line L. The connections of the main lineare normally completed between the point 1 and 4 through a switch orcircuit-interrupting device, M, which may be moved so as to sever theconnections and cause the main-line current to traverse the branch cir-'cuit, including the electro-magnet d. This magnet will then be vitalizedand cause a series of impulses to be sent upon the line depending uponthe tone to which the reed-armature is adapted to respond. Suchimpulsestraverse, at the distant station A, an electromagnet, (1 provided with areed-armature, e tuned to the same tone as the armature 6. Theseelectricalinterruptions or impulses will cause the armature e to be setin motion, and thus give a tone attracting the attention of the operatorat that station. It will be evident, however, that the armature 6 willnot respond to the ordinary movements of the keys employed for workingthe instruments upon the main line.

I claim as my invention- 1. Thecombination, substantially ashereinbefore set forth, with a main line and telegraph transmitting andreceiving apparatus,

of aharmonic transmitter, anormally-shunted branch circuit including thesame, means for placing said branch circuit in the direct circuit of themain line, and a harmonic receiver responding to the electricalvibrations established by said harmonic transmitter.

2. The combination, substantially as hereinbefore set forth, with a mainline and telegraph transmitting and receiving apparatus includedtherein, of a harmonic transmitter, a normally-closed shunt-circuit, aharmonic receiver at a distant station,tuned to the same pitch as thetransmitter and included in the main-line circuit, substantially asdescribed.

In testimony whereof I have hereunto subscribed my name this lith day ofJuly, A. D.

JOSEPH V. LARISH.

